I found an interesting theory while surfing yesterday which states that Manna was really tcilocybin mushrooms.
Then said the LORD unto Moses, Behold, I will vain bread from heaven for you; and the people shall go out and gather a certain rate every day, that I may prove them, whether they will walk in my law or no (16:4). And when the dew that lay was gone up, behold, upon the face of the wilderness there lay a small round thing, as small as the hoar frost on the ground (16: 14). And when the children of Israel saw if, they said one to another It is manna: for they wist not what it was. And Moses said unto them, This is the bread which the Lord hath given you to eat.
When I read this passage, I was struck by the fact that manna easily fits the description of psilocybe mushrooms. For one thing magic mushrooms are small and round, and since they sprout so rapidly they would seem to appear overnight, as if out of the sky. Also, anyone harvesting them would immediately notice that they turn blue where torn and had no roots, giving more reason to believe that the mushrooms were of celestial origin. Note that manna does not just fall from heaven, but instead it is described as coming with the frost and dew, during the wet seasons. These are the precise weather conditions for mushrooms to thrive. And finally, manna is described as a bread.
While I’m not sure I totally buy it, it does raise some rather fascinating explanations for a few things. Moses and the burning bush, for example. “WHOA, DUDE! That bush is on FIRE! And it’s TALKING!”
It’s possible we’ll never know precisely what “manna” was, but this theory is certainly entertaining. No wonder they didn’t notice they were hungry. They were too stoned.